/Engine/Plugins/Runtime/XRBase/Source/XRBase/Public/XRTrackingSystemBase.h
Access the loading screen interface associated with this tracking system, if any.
anIXRLoadingScreenpointer or a nullptr if this tracking system does not support loading screens.
virtual [IXRLoadingScreen](API\Runtime\HeadMountedDisplay\IXRLoadingScreen) * GetLoadingScreen()